{"id":1465,"date":"2026-09-24T00:19:46","date_gmt":"2026-09-24T00:19:46","guid":{"rendered":"https:\/\/luliancable.com\/cable-bending-radius-pulling-tension\/"},"modified":"2026-09-28T07:04:46","modified_gmt":"2026-09-28T07:04:46","slug":"cable-bending-radius-pulling-tension","status":"publish","type":"post","link":"https:\/\/luliancable.com\/ru\/cable-bending-radius-pulling-tension\/","title":{"rendered":"Bending radius, pulling tension and installation limits for 6-35 kV cable"},"content":{"rendered":"<div class=\"lllv\">\n<div class=\"sec\">\n<div class=\"wrap\">\n<p class=\"k\">\u00a701 \u2014 INSTALLATION<\/p>\n<p class=\"note\">Published 2026-09-24 \u00b7 Engineering note<\/p>\n<p>Installation limits get treated as a contractor&#8217;s problem, and then the tender comes back with a price for larger manholes or an extra joint chamber. In practice three numbers \u2014 minimum bending radius, maximum pulling tension and maximum sidewall pressure \u2014 are decided when the cable construction is chosen, and they are difficult to change afterwards. They belong in the specification.<\/p>\n<\/div>\n<\/div>\n<div class=\"sec\">\n<div class=\"wrap\">\n<p class=\"k\">\u00a702 \u2014 BENDING RADIUS<\/p>\n<h2>Set by construction, not by voltage<\/h2>\n<p>IEC 60502-2 does not fix an installation bending radius; the manufacturer states it for each construction. What drives it is whether the cable is armoured and whether it is single-core or multi-core, because those determine how the layers move when the cable is bent.<\/p>\n<table>\n<tr>\n<th>\u041a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u044f<\/th>\n<th>Typical minimum bending radius<\/th>\n<th>Why<\/th>\n<\/tr>\n<tr>\n<td>Unarmoured, single-core<\/td>\n<td>20 \u00d7 D<\/td>\n<td>No armour to hold the sheath; the screen and insulation layers carry the strain<\/td>\n<\/tr>\n<tr>\n<td>Unarmoured, multi-core<\/td>\n<td>15 \u00d7 D<\/td>\n<td>Laid-up cores support each other<\/td>\n<\/tr>\n<tr>\n<td>Armoured, single-core<\/td>\n<td>15 \u00d7 D<\/td>\n<td>Armour adds stiffness and resists ovality<\/td>\n<\/tr>\n<tr>\n<td>Armoured, multi-core<\/td>\n<td>12 \u00d7 D<\/td>\n<td>Armour plus a circular core assembly<\/td>\n<\/tr>\n<\/table>\n<p class=\"note\">D is the overall cable diameter. These are typical industry values for the purposes of pre-design. Always use the figure published for the specific construction you are buying \u2014 a large three-core cable and a small control cable obey the same principle but not the same multiple.<\/p>\n<p>The consequence is geometric. A 400 mm\u00b2 three-core armoured cable has an overall diameter in the region of 95 mm; at 12 D that is a 1.14 m radius, or 2.28 m across. A cable chamber or duct bend drawn at 1.5 m across will not accept it. This is worth checking at drawing stage rather than at delivery.<\/p>\n<\/div>\n<\/div>\n<div class=\"sec\">\n<div class=\"wrap\">\n<p class=\"k\">\u00a703 \u2014 PULLING TENSION<\/p>\n<h2>The conductor is the limiting element<\/h2>\n<p>During a pull, the force is applied to the conductor or to a pulling eye bonded to it, so the conductor cross-section sets the limit. The usual planning values are 50 N\/mm\u00b2 for copper and 30 N\/mm\u00b2 for aluminium. For a 185 mm\u00b2 copper conductor that is 9 250 N; for 240 mm\u00b2 it is 12 000 N.<\/p>\n<p>Whether that is enough depends on route length, weight, duct friction and the number of bends. A first estimate for a straight duct pull:<\/p>\n<p class=\"note\">T = \u03bc \u00d7 W \u00d7 L<\/p>\n<p>where \u03bc is the friction coefficient (0.3\u20130.5 for a cable in a duct is a normal planning range, higher if the duct is dirty or offset), W the cable weight per metre, and L the pull length. Bends multiply the figure: each bend adds a multiplier that depends on the angle and the friction coefficient, and three or four bends in a run is where estimates usually go wrong.<\/p>\n<p>Two practical points. First, pulling lubricant is not a detail \u2014 it changes \u03bc by a large factor and is cheaper than a larger conductor. Second, if the calculated tension approaches the conductor limit, the answer is usually an intermediate pull or a joint chamber, not a bigger cable.<\/p>\n<\/div>\n<\/div>\n<div class=\"sec\">\n<div class=\"wrap\">\n<p class=\"k\">\u00a704 \u2014 SIDEWALL PRESSURE<\/p>\n<h2>The check people skip<\/h2>\n<div class=\"grid3\">\n<div class=\"card\">\n<div class=\"num\">WHAT IT IS<\/div>\n<h3>Force per unit length on the bend<\/h3>\n<p>At a bend, the pulling tension presses the cable against the inside of the duct. The pressure is the tension divided by the bend radius: P = T \/ R.<\/p>\n<\/div>\n<div class=\"card\">\n<div class=\"num\">WHY IT MATTERS<\/div>\n<h3>It crushes the cable, not the conductor<\/h3>\n<p>Conductor tensile strength says nothing about this. Excessive sidewall pressure deforms the insulation and screen, and the damage is invisible from outside.<\/p>\n<\/div>\n<div class=\"card\">\n<div class=\"num\">TYPICAL LIMIT<\/div>\n<h3>Around 3 kN per metre of bend<\/h3>\n<p>Commonly used planning value for this class of cable. Larger bends are less severe; tight bends at full tension are the dangerous combination.<\/p>\n<\/div>\n<\/div>\n<p>The arithmetic explains why tight bends near the end of a long pull are the worst case: tension is at its highest and radius at its lowest, so the two effects multiply. Increasing the bend radius is usually cheaper than reducing tension, which means it is a duct-laying decision made before the cable is ordered.<\/p>\n<\/div>\n<\/div>\n<div class=\"sec\">\n<div class=\"wrap\">\n<p class=\"k\">\u00a705 \u2014 TEMPERATURE<\/p>\n<h2>Cold-weather installation<\/h2>\n<p>Sheath compounds stiffen as they cool, and below a certain temperature the cable should not be bent or pulled without pre-warming. PVC sheaths are generally not to be handled below about 0 \u00b0C; XLPE insulated cables with PE or LSZH sheaths are typically workable down to around \u221220 \u00b0C, but the figure depends on the sheath compound, not the insulation. For projects scheduled in winter or in cold climates, state the expected installation temperature in the enquiry so the sheath compound can be matched to it. Pre-warming the drum and working in short sections is the usual mitigation, but it requires the right compound to work at all.<\/p>\n<p class=\"note\">These are planning values for pre-design. The published installation instructions for the specific cable govern, and they should be on site before the pull starts.<\/p>\n<\/div>\n<\/div>\n<div class=\"sec\">\n<div class=\"wrap\">\n<p class=\"k\">\u00a706 \u2014 ORDERING<\/p>\n<h2>What to put on the drawing<\/h2>\n<p>Minimum bending radius, maximum pulling tension and maximum sidewall pressure all come from the construction, so they should be stated in the enquiry along with the route. Sending a route drawing with duct sizes, bend radii and manhole positions allows the construction to be chosen to suit the installation rather than the installation being adapted to whatever arrives.<\/p>\n<p>The <a href=\"\/ru\/products\/medium-high-voltage-cable\/\">6\u201335 kV medium voltage range<\/a> covers armoured and unarmoured constructions in single-core and three-core. Construction and test data for the 6.35\/11 kV class is on the <a href=\"\/ru\/products\/medium-high-voltage-cable\/11kv-xlpe-cable\/\">11 kV XLPE cable page<\/a>. For buried work where mechanical protection decides the armouring, the <a href=\"\/ru\/products\/power-cable\/yjv22-armored-power-cable\/\">armoured power cable page<\/a> covers the steel tape and steel wire options and the direct-burial rules.<\/p>\n<\/div>\n<\/div>\n<div class=\"sec\">\n<div class=\"wrap\">\n<p class=\"k\">\u00a707 \u2014 FAQ<\/p>\n<h2>Questions this raises<\/h2>\n<details>\n<summary>Should the bending radius be quoted for the drum or for installation?<\/summary>\n<div class=\"a\">\n<p>They are different figures. Drum diameter controls how tightly the cable is stored; the installation radius is what applies during the pull and in service. Both should be published, because a drum that is too small for the construction causes the same damage as a tight bend.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Can the cable be pulled by the armour instead of the conductor?<\/summary>\n<div class=\"a\">\n<p>No. Pulling on the armour loads the armour wires in tension and can displace them or tear the sheath. The pull is taken on the conductor via a pulling eye, or on a stocking grip combined with a pulling eye for the conductor, with the armour gripped only to guide the cable.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>How many bends are acceptable in one pull?<\/summary>\n<div class=\"a\">\n<p>There is no single number \u2014 it depends on the angle, the friction coefficient and the ratio of tension to sidewall limit. A route with three 45\u00b0 bends is lighter than one with two 90\u00b0 bends. The calculation, not a rule of thumb, should decide, and the calculation needs the actual duct geometry.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Does the same limit apply to triplex or trefoil single-core installations?<\/summary>\n<div class=\"a\">\n<p>The bending radius principle is the same, but single-core cables in trefoil are individually smaller and easier to handle, and their screen construction adds a constraint: repeated tight bending can damage the copper wire screen at the point where it wraps. Follow the published figure rather than deriving one from the conductor size.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>What if the site temperature is below the cable&#8217;s rated installation limit?<\/summary>\n<div class=\"a\">\n<p>Options are pre-warming the drum and pulling in short sections, or selecting a sheath compound rated for lower temperature. Pre-warming only helps if the compound itself is suitable \u2014 it raises the temperature temporarily rather than changing the material.<\/p>\n<\/div>\n<\/details>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Minimum bend radius, maximum pulling tension and sidewall pressure are the three limits that decide whether a cable arrives undamaged. The formulas, and the values for 6\u201335 kV.<\/p>","protected":false},"author":1,"featured_media":1450,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-1465","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cable Bending Radius &amp; Pulling Tension Limits | Lulian<\/title>\n<meta name=\"description\" content=\"Installation limits for 6-35 kV cable: minimum bending radius by cable type, maximum pulling tension formulas, sidewall pressure and drum handling practice on site.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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